The Under Armour Base 4.0 Crew Women's long underwear top is made up of mega-grid thermal fleece for the ultimate warmth in brutally cold conditions. With its quick-dry construction, any sweat or moisture will be wicked away, which will help keep you drier, lighter and more comfortable on the mountain. It also has a 4-way stretch construction for easier movement in any direction. Mega-Grid Thermal Fleece, Quick-Dry Construction, 4-Way Stretch Construction, Anti-Odor Technology, Raglan Sleeves, Thumbholes, 92% Polyester/8% Elastane, Fit: Tight, Warranty: Lifetime, Material: Synthetic, Weight: Mid, Type: Top, Wicking Properties: Yes, Recommended Use: Snow, Antimicrobial: Yes, Anti Odor: Yes, Quick Drying: Yes, Moisture Wicking: Yes, Model Year: 2020, Product ID: 590229, Model Number: 1353351-001 XS, GTIN: 0193444016246